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#!/usr/bin/sh

type getarg > /dev/null 2>&1 || . /lib/dracut-lib.sh

# systemd lets stdout go to journal only, but the system
# has to halt when the integrity check fails to satisfy FIPS.
if [ -z "$DRACUT_SYSTEMD" ]; then
    fips_info() {
        info "$*"
    }
else
    fips_info() {
        echo "$*" >&2
    }
fi

mount_boot() {
    boot=$(getarg boot=)

    if [ -n "$boot" ]; then
        case "$boot" in
            LABEL=* | UUID=* | PARTUUID=* | PARTLABEL=*)
                boot="$(label_uuid_to_dev "$boot")"
                ;;
            /dev/*) ;;

            *)
                die "You have to specify boot=<boot device> as a boot option for fips=1"
                ;;
        esac

        if ! [ -e "$boot" ]; then
            udevadm trigger --action=add > /dev/null 2>&1

            i=0
            while ! [ -e "$boot" ]; do
                udevadm settle --exit-if-exists="$boot"
                [ -e "$boot" ] && break
                sleep 0.5
                i=$((i + 1))
                [ $i -gt 40 ] && break
            done
        fi

        [ -e "$boot" ] || return 1

        mkdir -p /boot
        fips_info "Mounting $boot as /boot"
        mount -oro "$boot" /boot || return 1
    elif [ -d "$NEWROOT/boot" ]; then
        # shellcheck disable=SC2114
        rm -fr -- /boot
        ln -sf "$NEWROOT/boot" /boot
    fi
}

do_rhevh_check() {
    KERNEL=$(uname -r)
    kpath=${1}

    # If we're on RHEV-H, the kernel is in /run/initramfs/live/vmlinuz0
    HMAC_SUM_ORIG=$(while read -r a _ || [ -n "$a" ]; do printf "%s\n" "$a"; done < "$NEWROOT/boot/.vmlinuz-${KERNEL}.hmac")
    HMAC_SUM_CALC=$(sha512hmac "$kpath" | while read -r a _ || [ -n "$a" ]; do printf "%s\n" "$a"; done || return 1)
    if [ -z "$HMAC_SUM_ORIG" ] || [ -z "$HMAC_SUM_CALC" ] || [ "${HMAC_SUM_ORIG}" != "${HMAC_SUM_CALC}" ]; then
        warn "HMAC sum mismatch"
        return 1
    fi
    fips_info "rhevh_check OK"
    return 0
}

nonfatal_modprobe() {
    modprobe "$1" 2>&1 > /dev/stdout \
        | while read -r line || [ -n "$line" ]; do
            echo "${line#modprobe: FATAL: }" >&2
        done
}

fips_load_crypto() {
    local _k
    local _v
    local _module
    local _found

    FIPSMODULES=$(cat /etc/fipsmodules)

    fips_info "Loading and integrity checking all crypto modules"
    mv /etc/modprobe.d/fips.conf /etc/modprobe.d/fips.conf.bak
    for _module in $FIPSMODULES; do
        if [ "$_module" != "tcrypt" ]; then
            if ! nonfatal_modprobe "${_module}" 2> /tmp/fips.modprobe_err; then
                # check if kernel provides generic algo
                _found=0
                while read -r _k _ _v || [ -n "$_k" ]; do
                    [ "$_k" != "name" -a "$_k" != "driver" ] && continue
                    [ "$_v" != "$_module" ] && continue
                    _found=1
                    break
                done < /proc/crypto
                [ "$_found" = "0" ] && cat /tmp/fips.modprobe_err >&2 && return 1
            fi
        fi
    done
    mv /etc/modprobe.d/fips.conf.bak /etc/modprobe.d/fips.conf

    fips_info "Self testing crypto algorithms"
    modprobe tcrypt || return 1
    rmmod tcrypt
}

do_fips() {
    KERNEL=$(uname -r)

    if ! getarg rd.fips.skipkernel > /dev/null; then

        fips_info "Checking integrity of kernel"
        if [ -e "/run/initramfs/live/vmlinuz0" ]; then
            do_rhevh_check /run/initramfs/live/vmlinuz0 || return 1
        elif [ -e "/run/initramfs/live/isolinux/vmlinuz0" ]; then
            do_rhevh_check /run/initramfs/live/isolinux/vmlinuz0 || return 1
        elif [ -e "/run/install/repo/images/pxeboot/vmlinuz" ]; then
            # This is a boot.iso with the .hmac inside the install.img
            do_rhevh_check /run/install/repo/images/pxeboot/vmlinuz || return 1
        else
            BOOT_IMAGE="$(getarg BOOT_IMAGE)"

            # On s390x, BOOT_IMAGE isn't a path but an integer representing the
            # entry number selected. Let's try the root of /boot first, and
            # otherwise fallback to trying to parse the BLS entries if it's a
            # BLS-based system.
            if [ "$(uname -m)" = s390x ]; then
                if [ -e "/boot/vmlinuz-${KERNEL}" ]; then
                    BOOT_IMAGE="vmlinuz-${KERNEL}"
                elif [ -d /boot/loader/entries ]; then
                    i=0
                    # shellcheck disable=SC2012
                    for bls in $(ls -d /boot/loader/entries/*.conf | sort -rV); do
                        if [ "$i" -eq "${BOOT_IMAGE:-0}" ] && [ -r "$bls" ]; then
                            BOOT_IMAGE="$(grep -e '^linux' "$bls" | grep -o ' .*$')"
                            BOOT_IMAGE=${BOOT_IMAGE## }
                            break
                        fi

                        i=$((i + 1))
                    done
                fi
            fi

            # Trim off any leading GRUB boot device (e.g. ($root) )
            BOOT_IMAGE="$(echo "${BOOT_IMAGE}" | sed 's/^(.*)//')"

            BOOT_IMAGE_NAME="${BOOT_IMAGE##*/}"
            BOOT_IMAGE_PATH="${BOOT_IMAGE%${BOOT_IMAGE_NAME}}"

            if [ -z "$BOOT_IMAGE_NAME" ]; then
                BOOT_IMAGE_NAME="vmlinuz-${KERNEL}"
            elif ! [ -e "/boot/${BOOT_IMAGE_PATH}/${BOOT_IMAGE_NAME}" ]; then
                #if /boot is not a separate partition BOOT_IMAGE might start with /boot
                BOOT_IMAGE_PATH=${BOOT_IMAGE_PATH#"/boot"}
                #on some achitectures BOOT_IMAGE does not contain path to kernel
                #so if we can't find anything, let's treat it in the same way as if it was empty
                if ! [ -e "/boot/${BOOT_IMAGE_PATH}/${BOOT_IMAGE_NAME}" ]; then
                    BOOT_IMAGE_NAME="vmlinuz-${KERNEL}"
                    BOOT_IMAGE_PATH=""
                fi
            fi

            BOOT_IMAGE_HMAC="/boot/${BOOT_IMAGE_PATH}/.${BOOT_IMAGE_NAME}.hmac"
            if ! [ -e "${BOOT_IMAGE_HMAC}" ]; then
                warn "${BOOT_IMAGE_HMAC} does not exist"
                return 1
            fi

            (cd "${BOOT_IMAGE_HMAC%/*}" && sha512hmac -c "${BOOT_IMAGE_HMAC}") || return 1
        fi
    fi

    fips_info "All initrd crypto checks done"

    : > /tmp/fipsdone

    umount /boot > /dev/null 2>&1

    return 0
}